HTTP Status Code Checker

Check the HTTP response status code of any website URL.

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What is an HTTP Status Code?

HTTP status codes are three-digit numbers returned by a web server in response to a client's request. They indicate whether a specific HTTP request has been successfully completed, needs further action, or has encountered an error. Status codes are part of the HTTP protocol and are included in the server's response header.

Common Use Cases

For Web Developers

  • Debugging website issues and API errors
  • Implementing proper error handling in applications
  • Setting up correct redirects and content negotiation
  • Monitoring application health and performance

For SEO & Marketing

  • Checking for broken links and 404 errors
  • Verifying proper implementation of 301 redirects
  • Ensuring search engines can crawl content properly
  • Monitoring site availability and uptime

For Security Professionals

  • Identifying authentication issues (401, 403 responses)
  • Checking for information disclosure in error responses
  • Verifying proper security header implementation
  • Testing application behavior under various conditions

For System Administrators

  • Diagnosing server configuration issues
  • Troubleshooting gateway and proxy problems
  • Monitoring server load and response issues
  • Setting up health checks for infrastructure monitoring

HTTP Status Codes Reference

1xx: Informational Responses

100 - Continue

101 - Switching Protocols

102 - Processing

103 - Early Hints

2xx: Successful Responses

200 - OK

201 - Created

202 - Accepted

203 - Non-Authoritative Information

204 - No Content

205 - Reset Content

206 - Partial Content

3xx: Redirection Messages

300 - Multiple Choices

301 - Moved Permanently

302 - Found

303 - See Other

304 - Not Modified

307 - Temporary Redirect

308 - Permanent Redirect

4xx: Client Error Responses

400 - Bad Request

401 - Unauthorized

403 - Forbidden

404 - Not Found

405 - Method Not Allowed

408 - Request Timeout

418 - I'm a teapot

429 - Too Many Requests

5xx: Server Error Responses

500 - Internal Server Error

501 - Not Implemented

502 - Bad Gateway

503 - Service Unavailable

504 - Gateway Timeout

HTTP Status Code FAQs

What is an HTTP status code?

HTTP status codes are three-digit numbers returned by a web server in response to a client's request. They indicate whether a specific HTTP request has been successfully completed, needs further action, or has encountered an error. Status codes are grouped into five categories: 1xx (Informational), 2xx (Success), 3xx (Redirection), 4xx (Client Error), and 5xx (Server Error).

What does a 200 OK status code mean?

A 200 OK status code indicates that the HTTP request was successful. The server found the requested resource and returned it to the client. This is the most common and desirable response code for normal web page requests.

What's the difference between 301 and 302 redirects?

301 (Moved Permanently) indicates the resource has been permanently moved to a new URL, and search engines should update their indexes. 302 (Found) indicates a temporary redirect where the original URL should still be used in the future. For SEO purposes, 301 redirects pass link equity while 302s typically don't.

What does a 404 Not Found error mean?

A 404 status code means the server cannot find the requested resource. This often happens when a page has been deleted, moved without a redirect, or the URL was mistyped. It's a client error indicating the issue is with the request, not the server.

What causes 500 Internal Server Error?

A 500 status code indicates the server encountered an unexpected condition that prevented it from fulfilling the request. Common causes include server misconfigurations, programming errors, database connection issues, or resource exhaustion. Unlike 4xx errors, 5xx errors indicate the problem is on the server side.

What is the difference between 401 and 403 status codes?

401 (Unauthorized) means authentication is required but hasn't been provided or has failed. The client can retry with proper credentials. 403 (Forbidden) means the server understood the request but refuses to authorize it, even with valid credentials. The client doesn't have permission to access the resource.

Why do I see a 503 Service Unavailable error?

A 503 status code indicates the server is temporarily unable to handle the request, usually due to being overloaded or down for maintenance. This is temporary and the service should return. Servers often include a Retry-After header suggesting when to try again.

Pro Tips

  • • Always use 301 redirects for permanently moved content to preserve SEO rankings.
  • • Monitor 404 errors regularly and set up redirects for important deleted pages.
  • • Use 503 status codes with Retry-After headers during planned maintenance.
  • • 429 (Too Many Requests) with rate limiting helps protect your API from abuse.
  • • Check response headers - they contain valuable debugging information like cache control and content type.
  • • Implement custom error pages for 4xx and 5xx errors to improve user experience.
  • • Use browser DevTools Network tab to inspect status codes and headers in real-time.